Here you'll find articles related to how to share and view Outlook Calendars and Mailboxes
Adding an Additional Mailbox to Outlook
If you use Outlook for iOS or Outlook for Android, you can add a shared mailbox you have permissions to access on Outlook Mobile.
How To Add An Additional Email Account To Outlook Web
How to Delegate Access of Mail and Calendar
Shared calendars are Outlook calendars that multiple users can access simultaneously. Here's how to share a Shared Calendar if you have owner permissions.
How to share an outlook calendar with other people